Small-Signal Stability Assessment of Multi-infeed Converter Power System
The modern power gird is being transformed into a multiple converter
system (MCS) driven by the increasing integration of converter-based
resources (CBRs) such as wind and solar. In such an MCS, the dynamic
interaction between converter controls and the power network may cause
the small-signal stability issues. While static var generators (SVGs)
are integrated into the MCS for providing voltage support, they may
affect the small-signal stability. To understand the impact of SVGs,
this paper investigates the small-signal stability of the MCS with SVGs.
By constructing an equivalent model, the theoretical analysis finds two
key factors affecting the small-signal stability when SVGs are connected
to the MCS: 1) the topology and parameters of the power network
interconnecting SVGs and CBRs; 2) the dynamic interaction between the
SVGs and CBRs. Based on the results, a computationally efficient method
is proposed to assess the small-signal stability of the MCS with SVGs.
The analysis results and the proposed method are validated through
eigenvalue analysis, and electromagnetic transient simulation.